Centrifugal pump.



M. B. MAGNEILL.

GENTRIEUGAL PUMP.

APPLIOATION mmm AUG. 2, 1912.

1,195,807, Patented Aug. 4, 1914 gamma-snm 1.

M. B. MAGNEILL. GBNTRIPUGAL PUMP.

APPLICATION FILED AUG. 2, 1912. l 1,1 05,807, Patented Aug. 4, 1914 3 SHEpTS-SHEET 2.

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M556... y @www WM5/225. Wlacfzezfl M. B. MACNEILL.

GBNTRIFUGAL PUMP, APPLIOATION riLED AUG. 2, im`|v Patented Aug. 4, 1914.

3 SHEETS-SHEET 3.

5f .useful Improvement in Ccntrifu al Pumps,

UNLTED STATES NPiifriiiwr carica.

` MARTIN Bi MACNEILL, OF BELOIT, WISCONSIN, ASSIGNOR T FAIRBANKS, MORSE & COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented Aug. 4, i914.

. Application tiled August 2, 1912. Serial No. 712,980.

'a itizen of the United States, residing at Beloit,` in the county of Rock and State of Wisconsin,have invented a certain new and i l of which the following is a speci cation.

The present invention has reference 4to centrifugal or turbine pum s of the sin le 0l multi stage' type arrange for either orizoiital or vertical o eration and relates more particularly to an .improved adjustable and vautomatic end thrust co-iiiter-balancln de t vice which, when applied to pumps o the` 15".

character mentioned, serves a double pur pose, first, of neutralizin r lthe end thrust, thereby increasing the ci ciency by reason of the absence of a thrust bearing; second2 in permitting the shaft stuflingbox on the high pressure side of the pump to operate under a pressure only slightly' in excess of that at the pump suction, thereby obviating the troubles and friction losses ofa high pressure shaft packing.

Il accomplish my objects by the mechanism illustrated in the accompanying drawings, in whichl Figure 1 is a longitudinal central section through a horizontal single stage centrifugal pump. Fig. 2 is a transverse section o n line 2-2, of Fig. 1. Fig. 3 is a detail section .of part o'f the casing as shown in Fig. 1. Fig. 4 is a lon ritiidnal central section through a liorizonta three stage centrifugal pump. Fig. 5 is a longitudinal. central section through a yvertical single stagi,i centrifugal pump. Fig. 6 is an inverted-plan of the pump shown in Fig. 5. u

Similar numerals refer to similar parts throughout the several views.

Referring first to the horizontal single stage l On the inlet orlsuction side of the rotary im-r .peller is formed an annular flange 7 making a running joint with a coperating annular flange 8 locatedoii the casing. On rear side of the iiiipeller opposite to the iiilct an annular flange 10 is formed on the impellci' which forms a running joint with a coperating annular flange 11, `formed iipoii the casing. A pressure chamber l2 is foi-ined .between the casing and the impeller on the front side of the im aller while a similaipressure chamber 13 is formed between the impeller and the casing1 on the rear side of the impellei', The stu ng boxcs.2arc each connected by a duct 30 to the nearest orieo'f the pressure chambers 12, 13. By this meansthe stalling boxes arc water sealed. On the rear side of the iinpeller an annular flange 15 projects forward from the casin and cir eumferentially inclosesthehub16 oi'med on the rear of the impeller. Flange 15 is ap preciably smaller in diameter than flange 10 and in consequence a balancin chamber 18 is formed between them behin the im ellei'. One or' more ports 2O are formed in t e sta'- tionary ring or flange 16 and these communicate with one or more passages 21 formed within the inipellerliub and forming a communication between the ports and the suction or front side of the impcller.

Fitting' over the ring 15 is asleeve 23 provided with ports 24 which cooperate with. the ports 20 to control the flow of liquid from the balaiicin chamber 18 to the sages 21. Said 'seeve is rotary and i. trolled by means of set screws 26 mounted i'ii the casing iii position to eiiga'e ears 27 which project from said sleeve. tvlaid screws are locked in any desired position by loch nuts 28 which abut the surface of thc'casing. Iii operation, after the pump is primed by lbeing filled with water and the impeller is set in motion, a pressure is generated within the pump casing in the chambers 12 and 13 nearly equal to the pressure in the discharge passage 5. If this pressure were exerted on the entire area at the rear of the impeller 'itwould create a greater axial thrust than that exerted on thc front or in` let side, duc to the area on the inlet side being reduced by the poitioii cut away to form the inlet. As a result there will he an axial thrust set up in the direction of the pump suction, or toward the right of Fig. In consequence of the constructipn of my pump, however, this tendency is neu- `traliaed partly. at will and `partly autoplementing and "illustrate, controlling sleeve 23 will tween the flanges 10 and 11. That which leaks between the flanges 7 and 8 is imnie diately repumped. That fwhich leaks b etweenthe flanges 10n and 11 enters the balancing chamber 18. Now, in my device lthe automatic control arises from the-fact 'that the'annular' flange 16 at the inipeller hub projects to a point approximately even with thse'in er side of. port 20, whereby any lateral. motion of the rotating element will either throttle or openv said ports, thus 'inT creasingor diminishing Vthe pressure in the balancing chamber 18 and causing the iinpell'er to return to neutral position. To first be where,

manually'adjusted to the position the end under ordinary running conditions,

`thrust will be -approximately neutralized.

Any'v remaining end thrust will be a'utomatically overcome by flange 16, for if the thrust is toward thel suction due to excessive pressure in the-balancing,chamber 18, thev impeller' with its flange 16 will move slightly to the'right, Fig.` 1, thus opening up the 'ports 20, 24, and permitting freer flow from thebalancing chambervvhich will reduce the pressure :therein In my pump therefore, the balancingdevicis partly manual and partly automatic, the automatic control supassisting the manual control and enabling the pump to automatically take care of variations due to increased or decreased speed, et cetera. v'

1t will be noted that with my constructionthe friction losses at the rear stufling boit (at the left, Fig-1) are greatlyv reduced. This stufling box is adjacent to the balancing chamber' and as said chamber is in dif rect communication with the pump suction and there is a partialv throttliug between said 'chamber and the pump discharge regions, the pressure in the chamber will be only slightly in excess of that at the suction or inlet to the pump. Therefore the stuffing bor. doesvnot have to deal with high presv sures and consequently the stufling box glands do not have to be drawn up `nearly astightly as they otherwise would. v

The form of pump shown in Fig. 4 is similar as regards its balancing mechanism., to that shown in Fig. 1, hereinabove described. It is of the multistage stype having a plurality of impellers secured to a common shaft and having the vdischarge from the first or inlet impeller arranged to deliver Water to the inlet of the next adjacent 1mpelle'r', according to the Well'known, mami`l facture. The balancing mechanism is as- Will'by properly: adjusting the set A, screws 26 and thereby throttling to, thel sciated with` frm-pellen,v to-vvita the impeller at the 'final discharge end of the Pump "fInfFigsi 5.1an f6, lhave shown a vertical type lof pump aiid means for adjusting the controlling elcments'of the balancing device when the pump is running submerged or in deep dry Wells or such places as Will rendert'he adjusting mechanism shown in Figs. 1 and '4 impractical-` Here the shaft 101 stands vertical and passes through a stuffing box 102 in the casing 103. The casing. is provided with an inlet1011 and a discharge passageway 105 lyingl horizontal 'and cir.-

cumferentially ii'iclosing the impelle15'106.l

On the upper,.SuCtiOn side, an4 annular flange 107l makes a runningjoint with a'nannular flange'108 on the casing. On the lower/or rear side'the annularilang'e 110 on the impeller makes va running joint with the annular flange 111 on the casing. Pressure chambers 112 and 113 are formed on the upper land lower sides respectively ofthe im#v pelle-r. A. flange 115 fits over a iiange'116 on the impeller hub and a balancing chamber 118 is formed between flanges 110 and-115; A' port 120 is formed inflange 115 and\le'ads' tov a passage 121 formed inthe impeller hub and leading up through it to the inlet-side fof the impeller." A: controlling'sleevev 123,

is rotatablyfmounted upon flange 115' and is provideduitli one or morefports 124v'regg" isteringfwith the ports 120. The'functionand principle of operation'of these parts -is the same as the analogous parts herein# above described, there being an added element to be taken into consideration, however, to-wit, the Weight of the rotating ,element. This 4weight tends to partially counterbalance .the up thrust toward 'the suction. In this form'shown in Figs. 5 andi 6, 'the set screws are replaced by plungers 135 which slide withinthe casing.in"p osi' tion to engage the ears,127j'formed'upon the rotary sleeve. These plungei-s 'are op'- verated by a lever 13G fulcruined upon4 a pin 137' mounted in a bracket 138 extending .from the casing.` Said lever is articulately connected, preferably by slot and piircbnnection, at the points`139, 140, to the plun gers 135. Said lever is rotated about its fulcrum by a bell crank lever 141 fulcrumed, upon'a stationary pin 142, one armof saldi lever being art'iculately connected to lever" 13G-andthe other endto the controlling rod 143 which rises tothe top of the Well or to other convenient position where it ilo maybe reached by the attendant. Theparts are so constructed that theraising or lowering of rods 143 will rotate the sleeve'valve 123. It will beunderstood that when the proper setting forithe sleeve ,valve has once been determined itv will not be frequentlyaltered-I and will never. be moved "a great amount. It is convenient, therefore, to pro 1. In a machine of' the class described the combination of va rotary impeller having a passage throughthe huh thereof, a casing having; an inlet and a discharge passage, said casing;1 having a balancing chamber on the rear side of the impeller, an annular flange on the casing fitting over the 4impeller hub, a port in said flange leading from the balancing chamber to the passage through the impeller hub, and a manually controlled valve for controlling the flow through said Jort.

2. In a machine of the class described the' combination of a rotary inipeller having a passage through the hub thereof, a casing having an vinlet and a discharge passage, said casing having a balancing chamber on the rear side of `the impeller in'limited communication with the discharge, an an nular flange on the casing fitting;r over the iinpeller hub, a-port in said flange leading` from the balancing chamber to the passage through the impeller hub, a rotary sleeve fitting over said flange for controlling the port opening and manually operated means for rotating said sleeve.

3. ln a machine of thu` class described the combination of a rotary impellcr having a passage through the hub thereof, a casing having an inlet and a. discharge passage, said casing having a balancing chamber on Athe rear side ot' the impeller, anannular flange on thecasing fitting over the impeller hub,-a port in said flange leading from the halancingchamber to the passage through the impeller hub, a valve for said port, ears upon said valve for operating it, and` longitudinally movable elements engaging said ears and extending to a Vpoint outside of the casing whereby they may be manu`- ally adjusted. 4. lnta rotary pump, the combination of a rotary impeller, a casing therefor having' an inlet and a discharge passage, a balancing chamber communicating with said discharge passage, a port between said balancing chamber and the inlet, a flange on the impeller hub adapted to automatically control the flow through said port, and a manually operated valve also adapted to control the flow through said port, the cpntrol being: therefore dependent upon two independent factors, one of which is automatic and the other manual, y

In a machine of the class described, the combination of a rotary .iinpeller having a passage through the hub thereof, .a casing having an. inlet and a discharge passage, said casino; having; a halzmcinp,r chamber on the rear side of the impellcr in .limited communication with the discharge, an annular flange on the casing fitting over the impeller hub, a port in said flange leading from the lmlancime,r chaniber to the passage through the impeller hub, a rotary sleeve fitting over 'said flange foi" controlling theport opening, ears on said slccveon opposite sides of the axis ot' rotationthcreof, and lonptudinally .movable elements cn ,aging said ears and extending through to t ie outside of the `casing; whereby they may bemanipulated at,

will. y

6. In a centrifugml pomp thc combination of a rotary impellci, a casing; therefor having an inlet and ardischarge passage, a hub on said impeller projecting rearwardly and having a passage extending through it from the rear to the inlet side of the impcllifan annular flange on the casing fitting over the projectingr impcller hub and having a port at the end ofsaid hub whereby axial movemeut of the impeller will increase and di-v minish the port opening, there being a'chamber in the casing outside of the said hub and its inclosing annular flange, said chamber havingr limited communication with the dis-` charge, and a manually controlled valve for cooperating; with the impellcr huh to control f the flow through said p0rt.

7. In acentrifugal pump the combination oit a rotary impelltr, a casingr therefor havinn,r an inlet and a discharge passage, a hub on said impellcr projecting; ral'vardly and having u passage evl'cndiinir through it from the rear to thc inlet side ot the iinpeller, an annular flange on the casingr fitting over the projecting impeller hub and having a port at the end of said hub whereby axial movei ment of the impeller will increase and diminish the port opening, there being a chamber in the casing outside of the said hub and its inclosing annular flange, said chamber having limited communication with the disallarga, and a rotary sleeve fittingr over the annular flange on the casing and having an aperture adapted to register with said port for controlling the flow through it.

8. In a centrifugal pump the combination o of a rotary impeller, a casing therefor having an inlet and a discharge passage, a hub on said impeller projecting rearwardly and having a passage extending through it 4from the rear to the inlet side of the impeller, 'an annular flange on the casinar fitting over the; projecting impellcr hub and having;r a port at the end of said hub whereby axial movement of the impeller will increase and'diminish the port opening, there being,r a cham'- ber inthe casina' outside of the said huband. its inclosinaf annular flange, said chamber having limited communication with the dis' charge, a rotary sleeve fitting over the annui manual controlof the'sleeve.

l). In a centrifugal pump the combination of afrotary impeller'having` annular langee, a casing having an inlet and a discharge passage and having llanges making running joints with thev flanges on 'the ilnpellcr'4 whereby pressure chambers are formed on the front and rear sides of the impellei, which pressure chambers are in limited cornn'lunication with the discharge, a projecting 'Vitnessee hub on said impcller having a passage extending; 'rom vthe rear to the inlet side of the iinpellei, flange on the casing inta-fit#l ting; With said nnpeller hub and coperatlng mentioneli l v therewith and with the first flanges tio forni a balancing chamber on the Tear side of the impeller, a port leadingA from said balancing chamber to the passage in the iinpeller hub and a rotary element adapted to control the opening throughsanl port. e v

In Witness whereof, I have hereunto subscribed my naine in the presence of two Wit- DGSSQS. v l l MLB. MACNEILL.

W. C. AGKLEY, l

FRED. T. MERRILL. 

